feat(i18n): convert Settings dialog title + header to t() (Batch E)

src/lib/views/Settings.svelte

@@ -657,13 +657,13 @@
   class="overlay"
   role="dialog"
   aria-modal="true"
-  aria-label="Settings"
+  aria-label={t("settings.dialog_title")}
   tabindex="-1"
   use:trapFocus
 >
   <div class="panel">
     <header>
-      <strong>Settings</strong>
+      <strong>{t("settings.dialog_title")}</strong>
       <nav>
         <button class:active={section === "recording"} onclick={() => (section = "recording")}>
           <Mic size={14} aria-hidden="true" />